Valve grinder



SWL .13 1932- N. F. MQNAUGHT ET AL 1,877,348

VALVE GRINDER Filed Nav. 9. 1931 Patented Sept. 13, 1932 UNITED STATES Nonnrs E. MCNAUGHT AND EDWARD H. :eErEEso1v, oECHroAeo, ILLIivors, AssIGNoEs To DUEo METAL PRODUCTS coMrAN, or cHIcAeQrLLLNors, A ooniaoae'rro1vV or ILLINOIS vALvE GEINDER Application filed November 9,1931. l Serial No.' 578,816.

Our invention is concerned` with thev provision of improvements in those valve grinders which are operated by rolling their handles between the hands of the operator.

The present invention provides means for receiving the necessary downward thrust of the hands upon the tool and for preventing the hands of the operator from descending on the handle during the normal operation of the tool, these objects being accomplished without hampering that free movement of the hands which is necessary if the tool is to be most eectively and satisfactorily manipulated.

In the accompanying drawing illustrating a, preferred embodiment of our invention,

Fig. l is an elevational View of our improved valve grinder as it appears when in operation; and Y Fig. 2 is a similar view showing certain parts of the tool in axial section.

Similar characters of reference refer to similar parts throughout the drawing.

ln the drawing reference numeral 1 indicates an engine block provided with a poppet valve 2, the light unseating spring which usually is placed under the heads of engine valves during the grinding thereof being illustrated at 3. At 4 we have shown upwardly projecting stud bolts which` often are found on engine blocks in the vicinity of their valve seats.

The valve grinder comprises a wooden handle 5, the upper portion of which is cylindrical or substantially so, the handle being provided with a lower end 6 of reduced cross section which is adapted to be received and tightly embraced by the stem portion 7 of a rubber vacuum cup 8.

As thus far described, the valve grinder is not substantially different from valve grinders with which the art has been familiar for some time. We shall now describe those features of our improved tool which greatly increase its effectiveness and make it safer to use. Mounted on the handle 5, something more than a handsbreadth from the top thereon, is a metal collar 9 held firmly in position by brads 10, said collar 9 having an annularV shoulder 11.; `Disposed around the' collar f9` lfor free rotation thereon .is a sleeve 12 the upper end ofthis sleeve being shouldered against and riveted overa Vconcavo-conveX` metal-annulus 14, the convex surface ofthe. annulus 14 being upwardly presented. j

, Inthe useof the valve grinder, the vacuum cup 8 is applied to the top of the valve Zand,

therupper cylindrical portion of the handle 5 is pressed between the palms of ythe hands of the mechanic so that thehandle may be .oscillated first in one direction and then in the other by' simultaneous movements of the hands in opposite directions.

. VIn the tool of the present invention the annulus 14 constitutes arest forthe lower edges of the hands and receives the requisite 4downward thrust upon thetool without, however,

hampering the to and fro movements of thehands of the mechanic. Since the lower edges lof the hands engage the annulus at points. more distant `from the handle a-Xis than are` the points at which the palms of the ,hand pressagainst'the handle, it is importantthat the handle andthe annulus be relatively rotatable, i. e. so thattheyfmay oscillate at-dif ferent speeds when the ,tool is in use.v It will be understoodthat the annulus 14"y will prevent the 'hands `ofjthe mechanic from sliding down on thel handle of the toolf and thus will prevent their injury due to :acciv dental contactwith the studbolts 4 or-other proturbances which .frequently are found on engine blocks in the vicinityfof valves towbe ground..`V

Having thus illustrated and described a preferred embodiment of our invention, what we claim is new and desire to secure by Letters Patent of the United States is 1. In a valve grinder ofthe type operated by rolling its handles lbetween the palms of the hands of the operator, a handle, means for operatively connecting the lowery end of the handle with a valve, an annulus mounted on the handle a hands breadth or more below the upper end thereofand constituting a sup'- port forthe lower edges of the hands of the operator, said annulus being held againstv downward movement on the handle and being capable of free rotation on the handle, sothat roo the handle and annulus mayoscillate at different speeds under the influence of the palms and the lower edges respectively of the hands of the operator. 5 2. In a valve grinder of the class described, a handle provided at its lower end with means for facilitating itsattachmentto a valve, an annulus 'rotatablv mounted on the handle a hands breadth or more from the lupper end thereoiandmeais carried by thehandle a'ffording 'a thru'st`-bearing for said annulus. 3. In a Valve grinder ofthe class described, a rotatable handle, means at the lower-end of the handle adaptedto facilitate its appli-yY cation to aY valve to be ground, an annulus mounted on the handle and located a hands breadth vor Inor'e below the upper-end-there-` of, said annulus having a kconvex upper surface Land being freely rotatable upon the 2,0. handle but held'against downward movement v thereon. Y i Y 4:. In a Valve grinder of the class described, a handle, a vacuum cup atrthe lower end thereof adapted to be applied to the upper sur- 25. face of a valve lto -be ground,and an annulus Y mounted on the handle between its ends, said annulus adapted to rotate atY one speed under the infiuenceof the lower edges of the hands of the operator kas andvwhen the handle is 3,0: rotatedfat a diilerent speed under-the inluence. of the palms of the hands of the operator. 'Q y v `5. A-valve grinder of the class 4described having a, handle the lower end of which is 1; I adapted for *operative engagement with a valve to be ground, and ajeoncavo-convex annulus horizontally and rotatably disposed on said handle al hands breadth or morel 40* belowthe upper end ,thereof,the Convex surface of said'annulusbeing upwardly presented, said annulus being adapted to rotate at one speed under the influence ofthe loweredges of the handsof the operator as and when the handle is rotated at a dierent speed under the influence of the palms of the hands of the operator.-v -f l Y V i In witness whereof, we hereunto subscribe our names this 5th day of November, 1931. -NORRIS F. MCNAUGHI. f'

, 5 EDWARD H.. PET-Eason. 

